Key-bolt.



I MMMM I J. H. A. KRAuss.

KEY BOLT. APPLICATION FILED OCT. 27- 1913.

1,170,914.. Patented Fen 8, 1916;

'IIIIIIIII VIII/III THE COLUMBIA PLANOIIRAPH c0.. WASHINGTON, D. c.

JOHN H. A. KRAUSS, F Bos'roN, MASSACHUSETTS.

KEY-BOLT.

Specification Bf Letters Patent. P t ted Feb. 8, 1916.

Application filed October 27, 1913. Serial No. 797,491.

To all whom it may concern: 7

Be it known that I, JOHN H. A. KRAUss, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Key-Bolts, of

which the following is a specification.

My invention relates to key bolts and more particularly to that class ofbolts used in connection with an ordinary lock.

The primary object of my invention is to provide a bolt having meansthereon for guarding a key hole to prevent the key from being removedfrom the lock.

Another object of my invention is to provide a novel means for holdingthe bolt in closed or locked position.

A further object of my invention is to provide a bolt that is simple inconstruction, eflicient in operation, and which can be manufactured andput upon the market at a minimum cost.

A still further object of my invention is to provide a device inconnection with the key hole so that when the same is in closed positionit will also close the key hole.

Other objects as well as the nature, characteristic features, and scopeof my invention will be clear from the following de scription taken inconnection with the accompanying drawings and pointed out in the claims.

In the drawings: Figure 1, is a front ele. rational view of my inventionin locked or closed position. Fig. 2, is a front elevational view of myinvention in open position. Fig.

. 3, is a top plan view of my invention applied to a door showing theupper edge of the door partly broken away. Fig. 4, is a transverse,sectional view taken on line 44 of Fig. 3.

Referring more particularly to the drawings in which similar referencenumerals designates like or corresponding parts throughout the difierentviews, thenumeral 1, represents a base plate which has formed thereon aplurality of transversely extending spaced apart parallel yokes 2, anddisposed adjacent the outer end of the plate centrally between the yokesis a transversely extending key hole 3. Slidably arranged upon the baseplate 1, and guided and sup ported during its movement by the'yokes 2,is a locking plate 4, which plate is provided adjacent its inner endwith a knob 5, which also serves as a stop by contacting with the inneredge of the inner yoke, thus limiting inward movement of the lockingplate 4. The locking plate 4, is provided adjacent it's inthe positionas shown in Fig. 2, alines with the key hole arranged in the baseplate 1. Extending inwardly at right angles from the upper end'ofthe'key' hole 6, is a longitudinal slot 7.

For the purpose of locking the bolt pos1t 1on I have provided thelocking'plate 4, with a raised portion 10, which forms a shoulder 11,adjacent the knob 5. Disposed in the depressed portion 8, of the baseplate 1, is a flat spring 9, which bears against the.

locking plate 4, beneath the raised portion 10. v

In applying my device to the door 12, the base plate 1, is secured bymeans of screws or the like fastening members 13, so that the key hole3, alines with the key hole 14 in the lock 15, on the door 12, asclearly shown in Fig. 3, of the drawings.

The operation of my deviceis as follows: The key 16, having a fiatshank, is inserted in the key holes of the plate and the look when theyare in alinement, and by grasping the knob 5, pushing the locking plateforward, the slot 7, engages the flat shank of the key 9, and is lockedin place and held in this position by the spring 15, which forces thelocking plate 4, outwardly so that the shoulder 9, and the knob 5, areengaged upon the opposite edges of one of the yokes 2. To open, thelocking plate 4, is moved opposite end with a key hole 6, which, wheninwardly against the tension of the spring 7 and pulled backward. It isobvious that a key having a round shank, may be flattened by filing orthe like so that'it may be engaged by the slot in the locking plate.

It .is obvious. that when the bolt is in locked position,the outer endof thelocking plate is engaged in the socket member in the door frame.

It will be obvious to those skilled in the art to which my inventionrelates that modifications may be made in detail without departing fromthe spirit and scope of my invention.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:

In combination with a lock having a key hole and a key associatedtherewith, a base plate mounted adjacent said lock and provided with akey hole, a plurality of transversely extending yokes upon said baseplate, a relatively flat locking plate slidably supported by said yokes,said locking plate being provided With a key hole for registration withthe key hole of the base plate and lock, said locking plate beingfurther provided With a longitudinally extending slot terminating uponthe upper end of said key hole and adapted to receive said key, atransverse abutment upon said locking plate, a knob upon said lockingplate for facilitating the operation thereof, said base plate providedwith a longitudinally extending recess, and a bow spring mounted in saidrecess and bearing against said locking plate consequently maintainingsaid key in said 2 lock.

In testimony whereof I afliX my slgnature 1n presence of tWo wltnesses.

JOHN'H. A. KRAUSS.

Witnesses:

WILLIAM E. Moon, EDMUND G. WHITE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latents,

Washington, D. G.

